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Council informed of $116,919 change order at wastewater plant; work within loan contingency
Summary
Project staff reported silty soils under the aeration tank required excavation and stone replacement; the contractor moved forward and staff presented a $116,919 change order (less a $4,090 deduct), which officials said falls within the project's contingency of about $681,000.
Project staff updated the council on construction at the Oglesby wastewater treatment plant and described a site-specific issue that required a change to the aeration-tank foundation.
Ross Baker, a project representative, told the council the contractor encountered silty soil in about 10–20% of the tank footprint that posed a risk of differential settlement. Baker said geotechnical and structural teams recommended removing the bad soil and replacing it with compacted stone. He said crews also uncovered an old cistern that had to be removed, creating a void that required additional backfill and dewatering work.
Baker presented a change-order total of $116,919 for the additional excavation, stone placement, dewatering and trench-box rental; staff also reported a $4,090 deduct where an existing manhole could be saved. City staff said the project had been approved under a borrowing ordinance with contingency funds and that the contingency (about $681,000) is sufficient to cover this change order. The consultant said delaying the work would slow the critical path and could delay overall completion.
Council members asked about timeline and oversight. Project staff said construction began late summer, the project is expected to finish in 2027, and the work completed to date suggests roughly 10–15% of the project is finished. Staff said they would alert the council if cumulative change orders approach the contingency limit.
What happens next: because the work is within the approved contingency, staff indicated they will proceed and provide periodic updates; if future change orders exceed contingency, the council would be asked for action.
